Publication
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Notes on the collection of land-mollusca made by Dr. E . Jacobson on the Islands of Simalur and Babi in 1913, with descriptions of new species and races Article
Zoologische Mededelingen, 35(10), 125-138.January 1957
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Zoological Results of a Collecting Journey to Yugoslavia, 1954. 3. Süsswassermollusken mit Ausnahme der Sphaeriidae Article
Beaufortia, 5(60), 171-177.January 1957
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The species of Aplysia belonging to the subgenus Tullia Pruvot-Fol, 1933: On a generic character in statu nascendi Article
Beaufortia, 6(69), 83-114.January 1957
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Parnassiana nova : XIV. Kritische Revision der Gattung Parnassius (Fortsetzung 9) Article
Zoologische Mededelingen, 35(8), 79-111.January 1957
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Miscellaneous botanical Notes VIII Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 8(2), 514-517.January 1957
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Description d’un Symphurus inédit, fruit de la croisière 1899—1900 du Siboga Article
Beaufortia, 5(62), 183-185.January 1957
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Zoological Results of a Collecting Journey to Yugoslavia, 1954. 4. Wassermilben Article
Beaufortia, 5(61), 179-181.January 1957
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A study of the vegetation of the “Turfkoele” and of the Palynological character of the peat deposited in this swamp Article
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 144(1), 583-592.January 1957